Flat cable

A flat cable comprising:

• a base material that has flexibility;
• a signal conductor that is provided inside the base material and extends in a first direction,
• a first ground conductor and a second ground conductor that extend along the signal conductor, the first ground conductor and the second ground conductor being disposed so as to sandwich the base material from both sides of a thickness direction of the base material;
• and
• an interlayer connection conductor that is provided in the base material so as to connect the first ground conductor and the second ground conductor;
• wherein
• the second ground conductor includes:
• two elongated conductors that extend in parallel or substantially in parallel along the first direction at a spacing from each other;
• and
• bridge conductors that connect the two elongated conductors at predetermined points along the first direction;
• wherein
• the interlayer connection conductor includes a first interlayer connection conductor and a second interlayer connection conductor disposed so as to sandwich a connecting position of each of the elongated conductors with each of the bridge conductors along the first direction.